Here's why the flexibility and responsiveness of our nervous system are so important for getting healthy sleep, according to thesleepdoctor
HRV and sleep: a two-way streetThe activity of our ANS affects our ability to fall asleep and sleep through the night. How much and how well we sleep, in turn, affects the ability of our autonomic nervous system to function effectively, in everything from managing our stress response to regulating cardiovascular activity, blood sugar, and metabolism, as well as the hormones that affect mood and physiological function.
In stages of non-REM sleep, which include both light and deep slow-wave sleep, the parasympathetic systemREM sleep is broadly associated with a low and variable HRV.stage of sleep—increase sympathetic activity, elevate heart rate and blood pressure, and lower HRV.. And a typical 7-hour night of sleep contains between 4-5 sleep cycles. That gives you a sense of how complex and dynamic ANS activity is during sleep, with heart rate and heart rate variability continually shifting.
That imbalance is what occurs alongside disrupted, unrefreshing sleep and sleep disorders. And it’s not only an imbalance that occurs at night. Disordered sleep contributes to an imbalance in the autonomic nervous system and hyperactivity of the sympathetic nervous system throughout the 24-hour day.
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